how do I connect audio out to my pc speakers from my PS3 through my hdtv?

What I'm asking is basically in my topic question. However, to go into more detail, what I'm trying to do is get sound from both my hdtv and my pc speakers. Right now I'm able to connect my PS3 sound to my pc speakers but don't get sound from my hdtv. I can also get sound from my hdtv if I hook to audio in cables to the hdtv but don't get sound out of my pc speakers. I do have audio out cables but when I connect them from my hdtv to my pc speakers there is no sound coming out of them.

Before anyone concludes that I have not set my PS3 or TV to handle both sounds I have considered that and changed the settings to get sound from both my hdtv and my pc speakers.

Any help on this would be very appreciated.

Thanks for your input. What I'm doing right now is connecting the audio in cables from the PS3 to my pc speakers and that works. However, what I want to do (I'm trying to make this more clear) is to connect the PS3's audio cables to the audio in on my tv which gets me sound out of my tv and then go out of the tv to my pc speakers. To do that I am connecting audio cables to my audio output on my tv (white right), (red left) and then connecting them to my pc speakers. What happens is that no sound comes out of the pc speakers. Therefore, am I missing a step? Am I doing it wrong?

I'm sorry if this is still confusing, and I appreciate any input in answering my question.

Nevermind, I figured it out. I just used my hdmi to get sound for my tv and then used my audio cables from my PS3 for my pc speakers.